A block is sliding on a horizontal surface at a speed of $1 m s^{- 1}$ . The friction offered by the surface on the block is 1 N. A horizontal force is applied to the block to increase its speed to $2 m s^{- 1}$ . Now, the friction offered by the table will be:

1 N

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2 N

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3 N

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4 N

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Solution

The correct option is A 1 N
As the block is sliding on the horizontal surface, kinetic or sliding friction will be acting on it. On applying a horizontal force, the sliding friction or kinetic friction remains unchanged. Hence, kinetic friction will also remain unchanged, i.e., equal to 1 N.

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A block is sliding on a horizontal surface at a speed of 1 ms−1. The friction offered by the surface on the block is 1 N. A horizontal force is applied to the block to increase its speed to 2 ms−1. Now, the friction offered by the table will be:

The correct option is A 1 NAs the block is sliding on the horizontal surface, kinetic or sliding friction will be acting on it. On applying a horizontal force, the sliding friction or kinetic friction remains unchanged. Hence, kinetic friction will also remain unchanged, i.e., equal to 1 N.

A block is sliding on a horizontal surface at a speed of $1 m s^{- 1}$ . The friction offered by the surface on the block is 1 N. A horizontal force is applied to the block to increase its speed to $2 m s^{- 1}$ . Now, the friction offered by the table will be:

The correct option is A 1 N
As the block is sliding on the horizontal surface, kinetic or sliding friction will be acting on it. On applying a horizontal force, the sliding friction or kinetic friction remains unchanged. Hence, kinetic friction will also remain unchanged, i.e., equal to 1 N.